package com.ks.app.admin.util;

public class PageIndex { 
   private long startindex; 
     private long endindex; 
    public PageIndex(long startindex, long endindex) { 
         this.startindex = startindex;
    this.endindex = endindex;
    }
    public long getStartindex() {
         return startindex;
   }
 public void setStartindex(long startindex) {
         this.startindex = startindex;
    }
    public long getEndindex() {
       return endindex;
     }
   public void setEndindex(long endindex) {
       this.endindex = endindex;
     }
  public static PageIndex getPageIndex(long viewpagecount, int currentPage, long totalpage){
           long startpage = currentPage-(viewpagecount%2==0? viewpagecount/2-1 : viewpagecount/2);            
           long endpage = currentPage+viewpagecount/2;
             if(startpage<1){
                startpage = 1;
                if(totalpage>=viewpagecount) endpage = viewpagecount;
                 else endpage = totalpage;
          }
        if(endpage>totalpage){
                endpage = totalpage;
                if((endpage-viewpagecount)>0) startpage = endpage-viewpagecount+1;
               else startpage = 1;
            }
          return new PageIndex(startpage, endpage);       
     }
 }